Ch 14
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1. Why is a gas easier to compress than a liquid or a solid?
a. Its volume increases more under pressure than an equal volume of liquid does.
b. Its volume increases more under pressure than an equal volume of solid does.
c. The space between gas particles is much less than the space between liquid or solid
particles.
d. The volume of a gas’s particles is small compared to the overall volume of the gas.
2. Why does the pressure inside a container of gas increase if more gas is added to the container?
a. There is an increase in the number of collisions between particles and the walls of the
container.
b. There is an increase in the temperature of the gas.
c. There is a decrease in the volume of the gas.
d. There is an increase in the force of the collisions between the particles and the walls of the
container.
3. How does the gas propellant move when an aerosol can is used?
a. from a region of high pressure to a region of lower pressure
b. from a region of high pressure to a region of equally high pressure
c. from a region of low pressure to a region of higher pressure
d. from a region of low pressure to a region of equally low pressure
4. If the volume of a container of gas is reduced, what will happen to the pressure inside the container?
a. The pressure will increase.
b. The pressure will not change.
c. The pressure will decrease.
d. The pressure depends on the type of gas.
5. If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?
a. It increases.
b. It stays the same.
c. It decreases.
d. The pressure depends on the type of gas in the balloon.
6. What happens to the temperature of a gas when it is compressed?
a. The temperature increases.
b. The temperature does not change.
c. The temperature decreases.
d. The temperature becomes unpredictable.
7. As the temperature of the gas in a balloon decreases, which of the following occurs?
a. The volume of the balloon increases.
b. The average kinetic energy of the gas decreases.
c. The gas pressure inside the balloon increases.
d. all of the above
8. If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change
inside the container?
a. The pressure will be five times higher.
b. The pressure will double.
c. The pressure will be four times higher.
d. The pressure will not change.
9. Why does air escape from a tire when the tire valve is opened?
a. The pressure outside the tire is lower than the pressure inside the tire.
b. The pressure outside the tire is greater than the pressure inside the tire.
c. The temperature is higher outside the tire than inside the tire.
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d. There are more particles of air outside the tire than inside the tire.
When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____.
a. move faster
b. strike the walls of the container with less force
c. decrease in average kinetic energy
d. decrease in volume
The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?
a. It is reduced by one half.
b. It does not change.
c. It is doubled.
d. It varies depending on the type of gas.
The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas
pressure change?
a. It increases by a factor of four.
c. It increases by a factor of eight.
b. It decreases by a factor of eight.
d. It increases by a factor of two.
Boyle's law states that ____.
a. the volume of a gas varies inversely with pressure
b. the volume of a gas varies directly with pressure
c. the temperature of a gas varies inversely with pressure
d. the temperature of a gas varies directly with pressure
When the temperature and number of particles of a gas are constant, which of the following is also constant?
a. the sum of the pressure and volume
b. the difference of the pressure and volume
c. the product of the pressure and volume
d. the ratio of the pressure and volume
Charles's law states that ____.
a. the pressure of a gas is inversely proportional to its temperature in kelvins
b. the volume of a gas is directly proportional to its temperature in kelvins
c. the pressure of a gas is directly proportional to its temperature in kelvins
d. the volume of a gas is inversely proportional to its temperature in kelvins
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
a. It increases.
c. It decreases.
b. It stays the same.
d. The change cannot be predicted.
If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains
constant?
a. It increases.
c. It decreases.
b. It stays the same.
d. The change cannot be predicted.
When the volume and number of particles of a gas are constant, which of the following is also constant?
a. the sum of the pressure and temperature in kelvins
b. the difference of the pressure and temperature in kelvins
c. the product of the pressure and temperature in kelvins
d. the ratio of the pressure and temperature in kelvins
As the temperature of a fixed volume of a gas increases, the pressure will ____.
a. vary inversely
c. not change
b. decrease
d. increase
In general, for a gas at a constant volume, ____.
a. the pressure of the gas is inversely proportional to its temperature in kelvins
b. the volume of the gas is inversely proportional to its temperature in kelvins
c. the volume of the gas is directly proportional to its temperature in kelvins
d. the pressure of the gas is directly proportional to its temperature in kelvins
The combined gas law relates which of the following?
a. pressure and volume only
c. volume and temperature only
b. temperature and pressure only
d. temperature, pressure, and volume
____ 22. What does the ideal gas law allow a scientist to calculate that the other gas laws do not?
a. number of moles
c. volume
b. pressure
d. temperature
____ 23. How is the ideal gas law usually written?
a.
c. PV = nRT
=R
b.
= nR
d.
P=
____ 24. Which law can be used to calculate the number of moles of a contained gas?
a. Boyle’s law
c. ideal gas law
b. combined gas law
d. Charles’s law
____ 25. What happens to the partial pressure of oxygen in a sample of air if the temperature is increased?
a. It increases.
c. It decreases.
b. It stays the same.
d. The change cannot be determined.
Short Answer
26. A balloon filled with helium has a volume of 30.0 L at a pressure of 100 kPa and a temperature of 15.0 C.
What will the volume of the balloon be if the temperature is increased to 80.0 C and the pressure remains
constant?
27. A gas has a volume of 590 mL at a temperature of –55.0 C. What volume will the gas occupy at 30.0 C?
28. A rigid container of O has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273 K?
29. A 10-g mass of krypton occupies 15.0 L at a pressure of 210 kPa. Find the volume of the krypton when the
pressure is increased to 790 kPa.
30. A gas has a pressure of 710 kPa at 227 C. What will its pressure be at 27 C, if the volume does not change?
31. A gas occupies a volume of 140 mL at 35.0 C and 97 kPa. What is the volume of the gas at STP?
32. A gas storage tank has a volume of 3.5 10 m when the temperature is 27 C and the pressure is 101 kPa.
What is the new volume of the tank if the temperature drops to –10 C and the pressure drops to 95 kPa?
33. How many moles of N are in a flask with a volume of 250 mL at a pressure of 300.0 kPa and a temperature
of 300.0 K?
34. The gaseous product of a reaction is collected in a 25.0-L container at 27 C. The pressure in the container is
300.0 kPa and the gas has a mass of 96.0 g. How many moles of the gas are in the container?
35. What is the pressure exerted by 32 g of O in a 22.0-L container at 30.0 C?
36. A mixture of gases at a total pressure of 95 kPa contains N , CO , and O . The partial pressure of the CO is
24 kPa and the partial pressure of the N is 48 kPa. What is the partial pressure of the O ?
37. Use Graham’s law to calculate how much faster fluorine gas, F , will effuse than chlorine gas, Cl , will. The
molar mass of F = 38.0; the molar mass of Cl = 70.9.
Ch 14
Answer Section
MULTIPLE CHOICE
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p. 415
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p. 422, p. 432
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